The IQ scores for a random sample of subjects with low lead levels in their blood and another random sample of subjects

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The IQ scores for a random sample of subjects with low lead levels in their blood and another random sample of subjects with high lead levels in their blood were collected. The statistics are summarized in the accompanying table Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal: Complete parts (a) to (c) below OA. H₂₂₂ H₁ PP₂ OC. Ho H₁ H₂ H₁ 2 a. Use a 0.01 significance level to test the claim that the mean IQ score of people with low blood lead levels is higher than the mean IQ score of people with high blood lead levels What are the null and alternative hypotheses? Assume that population 1 consists of subjects with low lead lovels and population 2 consists of subjects with high lead level (Round to two decimal places as needed) (Round to three decimal places as needed.) ₁ Low Lead Level High Lead Level 2 OB. H₂ # H₂ P OD. H₂ 1 1/₂ H₂ 1₂ #1₂ n 1 1 87 94 35633 15.18861 29 17.51599 8.29487 The test statistic is The P-value is State the conclusion for the test OA. Fail to reject the null hypothesis. There is sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores
State the conclusion for the test. OA. Fail to reject the null hypothesis. There is sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores OB. Fail to reject the null hypothesis. There is not sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores OC. Reject the null hypothesis. There is not sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores. OD. Reject the null hypothesis. There is sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores. b. Construct a confidence interval appropriate for the hypothesis test in part (a). <4-20 (Round to one decimal place as needed) c. Does exposure to lead appear to have an effect on IQ scores? because the confidence interval contains Help me solve this View an example Type here to search Get more help. O P W © ta
The test statistic of z=1.30 is obtained when testing the claim that p+0.873. a. Identify the hypothesis test as being two-tailed, left-tailed, or right-tailed. b. Find the P-value. c. Using a significance level of a=0.01, should we reject H, or should we fail to reject H₂? Click here to view page 1 of the standard normal distribution table, Click here to view page 2 of the standard normal distribution table. a. This is a test. (Round to three decimal places as needed.) b. P-value= c. Choose the correct conclusion below. OA. Reject H, There is sufficient evidence to support the claim that p=0.873 OB. Fail to reject Ho. There is sufficient evidence to support the claim that p=0.873 OC. Reject Ho There is not sufficient evidence to support the claim that p=0.873 OD. Fail to reject Ho. There is not sufficient evidence to support the claim that p=0.873
A random sample of 760 births in New York State included 379 boys, and that sample is to be used for a test of the common bellet out the proportion of male birth in the population is equal to 8.512. Complete parts (a) through (c) a in testing the common belief that the proportion of male babies is equal to 0.512, idently the values of and p P (Round to three decimal places as needed) 379 b. For random samples of size 780, what sample proportions of male births are at least as extreme as the sample proportion of (Round to three decimal places as needed) OA. Those that are less than or equal to and those that are greater than or equal to OB. Those that are both greater than or equal to and less than OC. Those that are greater than or equal to D. Those that are less than or equal to Select the comed chuice below a 379 c. In using the method of randomization with 1000 resamples, it is found that 152 of them have sample proportions that are at least as extreme as Using a significance level of 0.05, what should be concluded about the
D. Those that are less than or equal to 379 c. In using the method of randomization with 1000 resamples, it is found that 152 of them have sample proportions that are at least at ang picance level of 0.05 what should be scade about the claim that the proportion of male births is equal to 0.5127 suficient evidence to There the claim that the proportion of male birthsis equal to 0.512.